My other coworker and I quit. My other coworker found a better job and I have a uni course to go to. My manager only had 3 staff, and since we both quit, there is now only 1 staff member. I worked an extra day because it was her birthday, but now my manager is making her cover every shift next week. She's (the manager) had interest in the job but refuses to hire any of the applicants, because they're immigrants and can only work 20 hours a week, or people have asked for Fridays off etc. so instead of hiring one of these people, she's making my coworker work sometimes 12 hour shifts on her own. I'm debating whether to offer to work next Saturday just to give my coworker a fucking break.